Bug-fixes:

- Don't DoS with 'swiotlb is full' message.
  - Documentation update.
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Merge tag 'stable/for-linus-3.14-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb bug-fixes from Konrad Rzeszutek Wilk:
 - Don't DoS with 'swiotlb is full' message.
 - Documentation update.

* tag 'stable/for-linus-3.14-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: Don't DoS us with 'swiotlb buffer is full' (v2)
  swiotlb: update format

Documentation/kernel-parameters.txt

@@ -3124,7 +3124,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			controller if no parameter or 1 is given or disable
 			it if 0 is given (See Documentation/cgroups/memory.txt)
 
-	swiotlb=	[IA-64] Number of I/O TLB slabs
+	swiotlb=	[ARM,IA-64,PPC,MIPS,X86]
+			Format: { <int> | force }
+			<int> -- Number of I/O TLB slabs
+			force -- force using of bounce buffers even if they
+			         wouldn't be automatically used by the kernel
 
 	switches=	[HW,M68k]
 

lib/swiotlb.c

@@ -510,7 +510,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 
 not_found:
 	spin_unlock_irqrestore(&io_tlb_lock, flags);
-	dev_warn(hwdev, "swiotlb buffer is full\n");
+	if (printk_ratelimit())
+		dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
 	return SWIOTLB_MAP_ERROR;
 found:
 	spin_unlock_irqrestore(&io_tlb_lock, flags);